Buggy code:
public String [ ] getRecognizedProperties ( ) { } public void setProperty ( String propertyId , Object value ) throws XMLConfigurationException { } public Boolean getFeatureDefault ( String featureId ) { } public Object getPropertyDefault ( String propertyId ) { } public void setDocumentHandler ( XMLDocumentHandler handler ) { } public XMLDocumentHandler getDocumentHandler ( ) { } public void startDocument ( XMLLocator locator , String encoding , NamespaceContext namespaceContext , Augmentations augs ) throws XNIException { } public void xmlDecl ( String version , String encoding , String standalone , Augmentations augs ) throws XNIException { } public void doctypeDecl ( String rootElement , String publicId , String systemId , Augmentations augs ) throws XNIException { } public void comment ( XMLString text , Augmentations augs ) throws XNIException { } public void processingInstruction ( String target , XMLString data , Augmentations augs ) throws XNIException { } public void startElement ( QName element , XMLAttributes attributes , Augmentations augs ) throws XNIException { } public void emptyElement ( QName element , XMLAttributes attributes , Augmentations augs ) throws XNIException { } public void endElement ( QName element , Augmentations augs ) throws XNIException { } public void startGeneralEntity ( String name , XMLResourceIdentifier resId , String encoding , Augmentations augs ) throws XNIException { } public void textDecl ( String version , String encoding , Augmentations augs ) throws XNIException { } public void endGeneralEntity ( String name , Augmentations augs ) throws XNIException { } public void characters ( XMLString text , Augmentations augs ) throws XNIException { } public void ignorableWhitespace ( XMLString text , Augmentations augs ) throws XNIException { } public void startCDATA ( Augmentations augs ) throws XNIException { } public void endCDATA ( Augmentations augs ) throws XNIException { } public void endDocument ( Augmentations augs ) throws XNIException { } public void setDocumentSource ( XMLDocumentSource source ) { } public XMLDocumentSource getDocumentSource ( ) { } public void attributeDecl ( String elementName , String attributeName , String type , String [ ] enumeration , String defaultType , XMLString defaultValue , XMLString nonNormalizedDefaultValue , Augmentations augmentations ) throws XNIException { } public void elementDecl ( String name , String contentModel , Augmentations augmentations ) throws XNIException { } public void endAttlist ( Augmentations augmentations ) throws XNIException { } public void endConditional ( Augmentations augmentations ) throws XNIException { } public void endDTD ( Augmentations augmentations ) throws XNIException { } public void endExternalSubset ( Augmentations augmentations ) throws XNIException { } public void endParameterEntity ( String name , Augmentations augmentations ) throws XNIException { } public void externalEntityDecl ( String name , XMLResourceIdentifier identifier , Augmentations augmentations ) throws XNIException { } public XMLDTDSource getDTDSource ( ) { } public void ignoredCharacters ( XMLString text , Augmentations augmentations ) throws XNIException { } public void internalEntityDecl ( String name , XMLString text , XMLString nonNormalizedText , Augmentations augmentations ) throws XNIException { } public void notationDecl ( String name , XMLResourceIdentifier identifier , Augmentations augmentations ) throws XNIException { } public void setDTDSource ( XMLDTDSource source ) { } public void startAttlist ( String elementName , Augmentations augmentations ) throws XNIException { } public void startConditional ( short type , Augmentations augmentations ) throws XNIException { } public void startDTD ( XMLLocator locator , Augmentations augmentations ) throws XNIException { } public void startExternalSubset ( XMLResourceIdentifier identifier , Augmentations augmentations ) throws XNIException { } public void startParameterEntity ( String name , XMLResourceIdentifier identifier , String encoding , Augmentations augmentations ) throws XNIException { } public void unparsedEntityDecl ( String name , XMLResourceIdentifier identifier , String notation , Augmentations augmentations ) throws XNIException { } public XMLDTDHandler getDTDHandler ( ) { } public void setDTDHandler ( XMLDTDHandler handler ) { } private void setErrorReporter ( XMLErrorReporter reporter ) { } protected void handleFallbackElement ( ) { } protected boolean handleIncludeElement ( XMLAttributes attributes ) throws XNIException { } protected boolean hasXIncludeNamespace ( QName element ) { } protected boolean hasXInclude2001Namespace ( QName element ) { } protected boolean isIncludeElement ( QName element ) { } protected boolean isFallbackElement ( QName element ) { } protected boolean sameBaseURIAsIncludeParent ( ) { String parentBaseURI = getIncludeParentBaseURI ( ) ; String baseURI = fCurrentBaseURI . getExpandedSystemId ( ) ; <START_BUG> return parentBaseURI . equals ( baseURI ) ; <END_BUG> } protected boolean searchForRecursiveIncludes ( XMLLocator includedSource ) { } protected boolean isTopLevelIncludedItem ( ) { } protected boolean isTopLevelIncludedItemViaInclude ( ) { } protected boolean isTopLevelIncludedItemViaFallback ( ) { } protected XMLAttributes processAttributes ( XMLAttributes attributes ) { } protected String getRelativeBaseURI ( ) throws MalformedURIException { } private String getIncludeParentBaseURI ( ) { } private int getIncludeParentDepth ( ) { } protected Augmentations modifyAugmentations ( Augmentations augs ) { } protected Augmentations modifyAugmentations ( Augmentations augs , boolean force ) { } protected int getState ( int depth ) { } protected int getState ( ) { } protected void setState ( int state ) { } protected void setSawFallback ( int depth , boolean val ) { } protected boolean getSawFallback ( int depth ) { } protected void setSawInclude ( int depth , boolean val ) { } protected boolean getSawInclude ( int depth ) { } protected void reportResourceError ( String key ) { } protected void reportResourceError ( String key , Object [ ] args ) { } protected void reportFatalError ( String key ) { } protected void reportFatalError ( String key , Object [ ] args ) { } private void reportError ( String key , Object [ ] args , short severity ) { } protected void setParent ( XIncludeHandler parent ) { } protected boolean isRootDocument ( ) { } protected void addUnparsedEntity ( String name , XMLResourceIdentifier identifier , String notation , Augmentations augmentations ) { } protected void addNotation ( String name , XMLResourceIdentifier identifier , Augmentations augmentations ) { }

Fix:
return ( parentBaseURI != null ) && ( parentBaseURI . equals ( baseURI ) ) ;